Previously configured custom calculated fields can be edited. This includes changing Field Type and renaming the field. All editing options for calculated fields can be found in the right-click context menu.
To edit the expression you entered in the Expression Editor, right-click the calculated field and select Edit Expression. For more information on the Expression Editor, see Using the Expression Editor.
To change the type of the calculated field, select Field Type. Options include String, Integer, Decimal, Boolean, DateTime, and Object.
To rename a calculated field, select Rename to enter the new name.